Physics
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..16...49h&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 16, no. 6, p. (6)49-(6)55
Physics
7
Atmospheric Models, Current Sheets, Electrons, Oxygen Ions, Planetary Magnetic Fields, Plasmas (Physics), Temperature, Planetary Ionospheres, Planetary Magnetotails, Polarization (Charge Separation)
Scientific paper
A model for the polar ion exosphere of Mars is developed to calculate the escape fluxes of oxygen ions and electrons through the plasma sheet of Mars at different exospheric temperatures (600K-2300K) along the magnetic field lines originating from the baropause at latitude 75 degrees and longitude zero degrees. The intensity of the magnetic field lines in the noon-midnight meridian plane at all latitudes are calculated by assuming that Mars has a weak magnetic field of dipolar nature. To calculate the electric potential in the region of magnetic field, quasi-neutrality condition is satisfied in such a way that escape fluxes of oxygen ions and electrons have to be equal at every point. It has been found that above Tinfinity = 2300K, the escape flux does not increase and has the maximum flux approximately 4.3 x 106/(sq cm)s and escape rate approximately 3.5 x 1024 ions/s. These values show close agreement with the observations taken by the TAUS (Solar Wind Plasma Instrument) and ASPERA (Automatic Space Plasma Experiment with Rotating Laser) experiments in the plasma sheet of Mars. The present calculation concludes that O(+) ions in the plasma sheet of Mars are mainly due to the escape of oxygen ions from the ionosphere in presence of a charge separation electric field.
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